EFFECT OF FILLER MATERIALS ON THE RHEOLOGICAL PROPERTIES OF FRESH CONCRETE

The present paper presents art experimental program that was carried o ut to investigate the effect of different types of filler material on the rheological properties of fresh concrete. The results showed that the different filler materials that had approximately the same particl e-size distribution and consisted mainly of quartz, potassium feldspar , plagioclase feldspar, and ground limestone, respectively did not aff ect the rheological properties of the fresh concrete very much. Howeve r a partial replacement of the pier with biotite muscovite, and chlori te distinctly increased the yield stress, but did not change the plast ic viscosity. The same effect was observed far an amphibole-type of ma terial containing 15 percent biotite. Also, for the various concrete m ires, the yield stress distinctly increased with time while the plasti c viscosity was not affected during a period of 50 min.